PHP takes the binary file header to determine the file type

/** * PHP takes the binary file header to quickly determine the file type * * @param file $file * @return String * @author Lrenwang * @blog blog.lrenwang.com */ function Get_extname ($file) { $fp = fopen ($file, "RB"); $bin = Fread ($fp, 2); Read-only 2 bytes Fclose ($FP); $bin _info = @unpack ("C2chars", $bin); $code = intval ($bin _info[' chars1 '). $bin _info[' chars2 ']); Switch ($code) { Case 7790: $type = ' exe '; Break Case 7784: $type = ' midi '; Break Case 8075: $type = ' zip '; Break Case 8297: $type = ' rar '; Break Case 255216: $type = ' jpg '; Break Case 7173: $type = ' gif '; Break Case 6677: $type = ' bmp '; Break Case 13780: $type = ' png '; Break Default $type = $code; Break } return $type; } ?> Copy Code

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